Multiple filter device



April 3, 1940. s. PALKl-N IULTIPLE FILTER DEVICE Filed July '11, 1939 2 Shuts-Sheet 1 N MEDGE .E

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Filed July 11, 1939 IULTIPLE FILTER mavica April INVENTOR SAMUEL PALKIN BY %I i.

ATTORNEYS I-IIIIIIIA PATENT orrlcs MULTIPLE FILTER DEVICE Samuel Palkin, Washington, I). 6., dedicated to the free use of the P the United States eople in a the territory of Applicationjuly ll, 1939, Serial No. 283,781

BCll-iml.

(Granted under the act of March a, 188?, as amended April so, 1928; 310 o. G. 751) This application is made under the act of March 3, 1883, as amended by the act of April 30, 1928, and the inventionherein described, if patented, may be manufactured and used by or for the Government, of the United States of America for governmental purposes without the payment to me of any royalty thereon.

I hereby dedicate the invention herein described to the free use of the People in the terri- 0 tory of the United States to take eflect on the iii granting of a patent to me.

This invention relates to devices for filtering and is especially useful in filtering viscous materials, such as oleoresin where the filtering speed is slow.

tegral part of a storage system, whereby filtering can be carried out during the storage of the material. While ordinarily it is desired to complete a filtering process as quickly as possible, in some cases, such as in the case of oleoresin, above mentioned, the filtration process per unit area is necessarily-slow. Accordingly, to avoid loss of time, this invention may be employed to carry out a slow filtration process while the material to be filtered is stored in tanks, or other suitable receptacles.

Another object of this invention is the provision of a filtering device in whichthe residue is formed on the outer surface with a. uniform thickness and in such a manner that when materials such as oleoresins consisting of suspensions of crystalline and other solid matter in a viscous liquid are filtered, the cake residue, after filtration, will be of a uniform dryness.

Another object of this invention is the provision of a filtering device which can be used either for simple gravity filtration or for suction filtration, and the change from gravity to suction fibtration can be accomplished without disturbing the Msembly.

the description hereinafter mven, three forms of my invention ore illustrated and tie-- scribed. rill three oi these em used for the imrposes and with the advantages above not lforth.

the scoompsrn'ing druuinus which illustrate the three embodiments of my invention:

l igure .1 is a vertical section through a liter te tank in which the first embodiment of my invention is disposed and shown partly in section.

Figure 2 is a fragmentary view of one of the filtering elements oi Figure l, with portions broken away to show the construction.

Figure 3 is a plan view oi Figure 22.

Figure (i is a front elevations! View, partly in section, of the second embodh'nent oi my invention disposed in a storage Figure 5 is a plan view, partly in section, of one One of the objects or this invention is the provision of a. device which can be used as an inof the filtering elements of the embodiment shown in Figure 4.

Figure 6 shows the third embodiment of my invention disposed in a storage tank, the view being in elevation and partly in section.

Figure 7 is a plan section along the line ll of Figure 6.

Referring with more particularity to Figures 1, 2, and 3, the first embodiment of my invention comprises a plurality of upright filter leaf units 10. Each of these units is made up of a plate II, which is corrugated in a vertical direction. This corrugated plate constitutes the core ofthe lean, and is covered with a screen l2 of suitable mesh. The corrugations of the plate ll keep the sides of the screen I! sufiicientiy separated. Each one of these leaves is provided with a stub pipe l3, held in place by suitable flanges l4 and I5, one on each side of the unit. The entire leaf is then covered with a suitable filter cloth I6, openings being provided in the cloth on both sides for the stub pipe l3. These leaves are assembled by means of spacers ll, said spacers having a central bore I8 within which the stub pipes I3 fit sufficiently tight;v to prevent undue leakage. Each of the stub pipes I3 is provided with apertures. l9 through its wall communicating with the space between the filter cloth it of its corresponding leaf. The leaf on one extreme end has the outer end of its stub pipe sealed. The leaf on the other end communicates with an exterior draining system through a removable pipe fitting 20, This pipe fitting, when in place, secures the entire device to the bottom of the tank 2!, and, when removed, permits the entire apparatus to be lifted out. The lifting out of the apparatus and the setting of it in place may be accomplished by means ofany desiredlifting device, such as a horizontal. shelf 22 attached to vertical straps 23 depending from a handle bar it.

in; this embodiment, it will be observed, that r us many filter leaves may be employed as desired by simply inserting or removing additional leaves together with corresponding spacers il Conseouentiy, this device is extremely flexible in use and can be used for any desired size or shape of storage tank. in the actual operation of this device, the liquid placed in the tam: may filter by gravity andthe filtrate enters through the interstices oi the filter cloth iii, thence through the screen it into, the space between the sides or said screen where the corrugated plate. ii is olis-= posed. Us. striking this'plate; the filtrate runs down toward the bottom along the vertical corrunations, entering the stub pipes through the apertures iihand thence passing out oi the tonic iii through the pipe connection 2&5. Ii it is desired to use the device in soon filtration, the fitting it is connected to a suitable source oi vacuum which, acting through apertures l9, draws the ill ment of this invention, the principle is practically the same except that a slightly modified arrangement is employed. In this embodiment instead of employing the single vertical filter leaf units, each unit 25 is U-shaped, substantially as shown, the vertical arm 26 of each unit having substantially the same construction as the filter leaves in the embodiment first described. The horizontal base 21 of each filter unit also has the same construction, and has a vertical tube 28 connected thereto. Apertures 29 in the tube 28 communicate with the space between the 'filter cloths, substantially the same as the apertures 19 in the previously described embodiment. The tube 28 is sealed at its upper end and is held in place by means of flanges 30 and 3i. The lower portion of each tube 28 is adapted to register with a flange opening 32, each unit being supported by the flange thereof,

the opening communicating with a horizontal vacuum system in the same manner as the embodiment above described. In this embodiment, filter units can be added only by utilizing a larger pipe 33, having the required number of apertures for accommodating the tubes 28 of the filter units. However, this embodiment has the advantage in that any unit may be temporarily removed, cleaned, and replaced without affecting the other filter units. of filter units may be made in a comparatively short time.

The embodiment shown in Figures 6 and 7 comprises a horizontal leaf 3'! and a plurality of vertical leaves 38, removably attached to the horizontal leaf. All of these leaves are constructed in the same manner as the filter leaves described in the two embodiments above mentioned. In this embodiment, however, the horizontal leaf serves two purposes. a filtering unit and to replace the horizontal tube 33, thus simplifying construction. The vertical leaves 38 are removably disposed on the horizontal leaf 3'! by any suitable means. The means shown in the drawings consist of U-pins 39 projecting through the upper wall, adapted to slidably engage the vertical filter leaves. In this embodiment-it is preferable to have the filter cloth placed over the assembled leaves rather than over individual leaves before assembling. In other words, the filter cloth is only placed over the effective filter surfaces. In this manner the spaces between the filter cloths are mutually communicating. Through the bottom of the horizontal filter leaf an outlet pipe 40 is secured to which the filtrate passes from all of the leaves. This outlet tube lll registers with, and is sealed in, a suitable aperture in the bottom of the storage tank 4|, substantially as shown. The assembled leaves are held together in spaced relation by means of a notched header 42 disposed on the vertical leaves. substantially as shown, which is Also a complete change It acts both :98

means held in place by means of straps 43, of wire or any other suitable material. A lifting device 44, attached to the header 42, may be employed for placing the apparatus in the storage tank and removing it therefrom.

- having aperturesthrough its wall communicat ,stub pipes of said leaves in series, and a central outlet for the assembled series.

3. A filter apparatus comprisinga plurality of U-shaped filterleaves, said leaves comprising corrugated plate cores, screen casings for said cores, filter cloths encasing said screen casings, a vertical stub pipe through the base of each of said leaves, said stub pipe having apertures through its wall communicating with the space in the core of its respective leaf, a horizontal tube, said tube having a plurality of spaced vertical apertures therethrough engaged with the said stub pipes, one pipe for each aperture, and a central; outlet in said horizontal tube.

4. A filter apparatus comprisinga plurality of U-shaped filter leaves, said leaves comprising corrugated plate cores, screen casings for said cores, filter cloths encasing said screen casings, a vertical stub pipe through the base of each of said leaves, said stub pipe having apertures through its wall communicating with the space in the core of its respective leaf, a horizontal tube, said tube having a plurality of spaced vertical apertures therethrough removably engaged with the said stub pipes, one pipe for each aperture, and a central outlet in said horizontal tube.

5. A filter apparatus comprising a plurality of filter leaves, one of said leaves being horizontally disposed and the others being vertically disposed thereon inspaced relation, each of said leaves comprising a corrugated plate core, a screen encasing said core, a filter cloth encasing the effective filter surfaces. of the assembled. leaves, and a central outlet for the space in the cores of said leaves.

, 6. A filter apparatus comprising a plurality of filter leaves, one of said leaves being horizontally disposed and the others being vertically disposed thereon in spaced relation, means for removably supporting said vertical leaves on said horizontal leaf, each of said leaves comprising a corrugated plate core, a screen encasing said core, a' filter cloth encasing the effective filter surfaces of the assembled leaves, and a central outlet for the space between that portion of the filter cloth about said horizontal leaf.

SAMUEL PALKIN. 

